Please use this identifier to cite or link to this item: doi:10.22028/D291-24099
Title: Elasto- and electro-optical dipole properties of off-center Ag+ defects in RbI
Author(s): Donatti, D. A.
Li, M. S.
Aegerter, Michel A.
Language: English
Year of Publication: 1983
OPUS Source: Radiation effects. - 73.1983, S. 123-129
SWD key words: Dipol
DDC notations: 500 Science
Publikation type: Journal Article
Abstract: Electric dipole properties of off-center Ag+ defects, introduced by a diffusion technique, were investigated in RbI. After rapid quenching and cooling the absorption spectrum consists of 4 UV bands at 4.82, 4.92, 5.12 and 5.47 eV. Their oscillator strength slightly decreases then rises with increasing temperature. Weak zero moment changes in all bands were observed when high electric field was applied along the <110> and <111> directions only. No effect occurs along <100>. The sign of the effect allows the determination of the main state of polarization of the bands: perpendicular to the dipole axis for the 4.82 and 5.12 eV, parallel to it for the 4.92 and 5.47 eV. Two models which fit equally well the results are discussed: a <111> dipole model and a restrictive <110> model with 90° reorientation only. They lead to a dipole moment of 1.16 eÅ, respectively 1.34 eÅ if polarization of the bands is assumed. Several arguments favor the <111> model with deep off-center wells for Ag+ in RbI.
Link to this record: urn:nbn:de:bsz:291-scidok-22584
Date of registration: 21-Jul-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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